Enhanced Methanization of Long-Chain Fatty Acid Wastewater at 20°C in the Novel Dynamic Sludge Chamber–Fixed Film Bioreactor

摘要: Lipid-containing wastewaters, such as those arising from dairy processing, are frequently discharged at temperatures ≤20°C. Their valorization low ambient offers opportunities to expand the application of high-rate anaerobic wastewater treatment towards achieving energy neutrality by minimizing demand for heating. Lipid hydrolysis generates long chain fatty acids (LCFA), which incur operational challenges and hinder stable bioreactor operation inducing sludge flotation washout, coupled with added challenge lower temperature (20°C). These tackled together uniquely during LCFA-rich synthetic (SDW) (33% COD-LCFA) through de-novo formed microbial granular within dynamic chamber fixed film (DSC-FF) reactor. The novel reactor design facilitated retention entire period 150 days containing settled, floating LCFA-encapsulated biofilm a single module. High COD removal efficiencies (87-98%) were achieved in three replicated DSC-FF reactors, along complete LCFA 18-72 h HRT (LCFA loading rate 220-890 mgCOD-LCFA/L·d) partial 12 1333 mgCOD-LCFA/L·d). high unsaturated saturated LCFAs reported first time continuous Moreover, de novo granulation was 8 d combination inoculum mixtures concentration SDW. results demonstrate feasibility treating wastewaters discharge offer potential expanded more energetically productive lipid-rich wastewater.